/*!
 * ${copyright}
 */

// Provides control sap.m.SuggestionsList.
sap.ui.define([
		'./library',
		'./SuggestionsListRenderer',
		'sap/ui/core/Control'
	], function(library, SuggestionsListRenderer, Control) {
		"use strict";

		//
		// SuggestionsList has to be used exclusively by Suggest.js
		//
		var SuggestionsList = Control.extend("sap.m.SuggestionsList", {
			metadata: {

				library: "sap.m",
				properties: {
					width: { type: "sap.ui.core.CSSSize", group: "Dimension", defaultValue: "auto" },
					maxWidth: { type: "sap.ui.core.CSSSize", group: "Dimension", defaultValue: "100%" }
				},
				associations: {
					parentInput: { type: "sap.ui.core.Control", multiple: false, singularName: "parentInput" },
					ariaLabelledBy: { type: "sap.ui.core.Control", multiple: true, singularName: "ariaLabelledBy" }
				}
			},
			renderer: SuggestionsListRenderer
		});

		SuggestionsList.prototype.init = function() {
			this._iSelectedItem = -1;
		};

		SuggestionsList.prototype.onBeforeRendering = function() {
			this.$().off();
		};

		SuggestionsList.prototype.onAfterRendering = function() {
			// only on desktop: prevent blur of the search field
			this.$().on("mousedown", function(event){
				event.preventDefault();
			});
		};

		SuggestionsList.prototype.getItems = function(){
			try {
				return sap.ui.getCore().byId(this.getParentInput()).getSuggestionItems();
			} catch (e) {
				return [];
			}
		};

		// Update DOM in place
		SuggestionsList.prototype.update = function(){
			var rm;
			var domRef = this.getDomRef();
			if (domRef) {
				rm = sap.ui.getCore().createRenderManager();
				this.getRenderer().renderItems(rm, this);
				rm.flush(domRef);
				rm.destroy();
			}
			return this;
		};

		// select an item to highlight it visually by keyboard navigation
		SuggestionsList.prototype.selectByIndex = function(iIndex, bRelative){

			var items = this.getItems();
			var index;
			var item;
			var itemId;
			var parentInput = sap.ui.getCore().byId(this.getParentInput());
			var descendantAttr = "aria-activedescendant";

			// selectByIndex(null || undefined || -1) -> remove selection
			if (isNaN(parseInt(iIndex))) {
				iIndex = -1;
				bRelative = false;
			}

			if ((!items.length) || (bRelative && iIndex === 0) || (!bRelative && iIndex < 0)) {
				index = -1;
			} else {
				if (bRelative) {
					if (this._iSelectedItem < 0) {
						index = (iIndex < 0 ? items.length : -1) + iIndex;
					} else {
						index = this._iSelectedItem + iIndex;
					}
				} else {
					index = iIndex;
				}
				index = Math.min(Math.max(index, 0), items.length - 1);
			}
			this._iSelectedItem = index;

			// Highlight the selected item.
			if (items.length) {
				this.$().children("li")
					.removeClass("sapMSelectListItemBaseSelected")
					.attr("aria-selected", "false")
					.eq(index)
					.addClass("sapMSelectListItemBaseSelected")
					.attr("aria-selected", "true");
			}
			// set aria-activedescendant attribute in the input itself:
			if (parentInput) {
				if (index >= 0) {
					item = parentInput.getSuggestionItems()[index];

					if (item) {
						itemId = item.getId();
						this._scrollToItem(item);
					}
				}
				if (itemId) {
					parentInput.$("I").attr(descendantAttr, itemId);
				} else {
					parentInput.$("I").removeAttr(descendantAttr);
					parentInput.$("SuggDescr").text("");
				}
			}

			return this._iSelectedItem;
		};

		/**
		 * Scroll to the item if it is not visible on the popover.
		 *
		 * @private
		 * @param {object} oItem The item to scroll to.
		 */
		SuggestionsList.prototype._scrollToItem = function(oItem) {
			var oPopoverDomRef = this.getParent().$().find(".sapMPopoverCont")[0],
				oPopoverRect,
				oItemRect,
				iTop,
				iBottom;

			if (!oItem || !oItem.getDomRef() || !oPopoverDomRef) {
				return;
			}

			oItemRect = oItem.getDomRef().getBoundingClientRect();
			oPopoverRect = oPopoverDomRef.getBoundingClientRect();

			// If the item is outside of the popover scroll to it.
			iTop = oPopoverRect.top - oItemRect.top;
			iBottom = oItemRect.bottom - oPopoverRect.bottom;
			if (iTop > 0) {
				oPopoverDomRef.scrollTop = Math.max(oPopoverDomRef.scrollTop - iTop, 0);
			} else if (iBottom > 0) {
				oPopoverDomRef.scrollTop = oPopoverDomRef.scrollTop + iBottom;
			}
		};

		SuggestionsList.prototype.getSelectedItemIndex = function(){
			return this._iSelectedItem;
		};

		return SuggestionsList;

	});